CN116068395A - Parameter testing method of linear induction motor in static state - Google Patents
Parameter testing method of linear induction motor in static state Download PDFInfo
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- CN116068395A CN116068395A CN202310206436.5A CN202310206436A CN116068395A CN 116068395 A CN116068395 A CN 116068395A CN 202310206436 A CN202310206436 A CN 202310206436A CN 116068395 A CN116068395 A CN 116068395A
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- 230000006698 induction Effects 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 title claims abstract description 17
- 230000003068 static effect Effects 0.000 title claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 15
- 230000005284 excitation Effects 0.000 claims description 44
- 238000002474 experimental method Methods 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000010998 test method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005339 levitation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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Abstract
The invention discloses a parameter testing method of a linear induction motor in a static state, wherein a motor rotor is in the static state, and the method is suitable for a short primary linear induction motor and a long primary linear induction motor. Firstly, taking out an induction plate of a motor secondary, applying alternating current with preset voltage and frequency to an input end of a motor primary winding, and obtaining a current effective value, apparent power and active power of the input end of the motor. And then, restoring the structure of the secondary induction plate of the motor, applying alternating current with preset voltage and frequency to the input end of the primary winding of the motor, and obtaining the effective value of the current, apparent power and active power of the input end of the motor. And finally, according to the test value, calculating each parameter in the T-shaped equivalent circuit of the induction motor.
Description
Technical Field
The invention relates to the field of motor testing, in particular to a parameter testing method of a linear induction motor in a static state.
Background
Because of no wheel rail contact, the vibration is little, the travelling comfort is better, the maglev train does not rub with the rail when running, and the noise is lower. The magnetic levitation train has the advantages of rapidness, low consumption, environmental protection, safety and the like, so the magnetic levitation train has very broad prospect. The linear induction motor is the core power of the middle-low speed maglev train, so that the accurate parameters of the linear induction motor are obtained to directly relate to the running stability of the middle-low speed maglev train. The existing motor parameter experiment acquisition method is composed of an open circuit and short circuit test method, so as to obtain the exciting resistance in the T-shaped equivalent circuit of the induction motorExciting reactance->Secondary leakage inductance->Secondary resistance->The open circuit test method is easier to develop in a rotary induction motor, however, the open circuit test of a linear induction motor requires a long track and a large space for an experimental device platform, as shown in fig. 1. Therefore, the open circuit test experiment is difficult to develop on the linear induction motor.
Disclosure of Invention
In order to solve the technical problems, the invention provides a parameter testing method of a linear induction motor, which is a method for testing parameters of the linear induction motor in a static state. Firstly, taking out an induction plate of a motor secondary, applying alternating current with preset voltage and frequency to an input end of a motor primary winding, and obtaining a current effective value, apparent power and active power of the input end of the motor. And then, restoring the structure of the secondary induction plate of the motor, applying alternating current with preset voltage and frequency to the input end of the primary winding of the motor, and obtaining the effective value of the current, apparent power and active power of the input end of the motor. And finally, according to the test value, calculating each parameter in the T-shaped equivalent circuit of the induction motor. The motor rotor is in a static state and is suitable for a short primary linear induction motor and a long primary linear induction motor.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a parameter testing method of a linear induction motor in a static state comprises the following steps:
the first step, the induction plate of the motor secondary as the conducting layer is taken out, the secondary iron yoke as the conducting layer is reserved, and the preset voltage is applied to the input end of the motor primary windingAnd frequency->And measuring the phase current effective value +.>Three-phase active power->The method comprises the steps of carrying out a first treatment on the surface of the Primary resistance->And series excitation resistance->The relation of (2) is:
wherein the power factor in the state of taking out the conductive layerThe method comprises the following steps:
wherein ,for the number of phases of the primary winding, +.>To take out the power factor angle of the conductive layer;
in the excitation branch, an excitation resistor is connected in seriesParallel excitation resistor->With primary core loss->The relation of (2) is:
series excitation reactanceApproximately equal to parallel excitation reactance->When->In the case of known, primary leakage reactanceThe method comprises the following steps:
secondly, restoring a secondary induction plate of the motor, and performing a locked rotor experiment of the linear induction motor; applying a preset voltage to the input end of the primary winding of the motorAnd frequency->And (2) alternating current ofMeasuring the phase current effective value +.>Three-phase active power->;
Total equivalent resistance of exciting branch and secondary branchReactance->The method comprises the following steps:
wherein ,for the power factor angle in the motor locked-rotor state, < >>The power factor is the power factor of the motor in the locked state; />
the series excitation resistance calculated in the first stepSeries excitation reactance->Obtaining a secondary branchResistance in the way->Reactance->:
The beneficial effects are that:
aiming at the problem that the open circuit test experiment is difficult to develop on the linear induction motor, the method adopts an experimental test method of a primary and secondary static state to acquire all parameters of the motor, and avoids the requirement of the traditional open circuit test on the secondary length of the linear motor.
Drawings
FIG. 1 is a diagram of a T-type equivalent circuit of an induction motor;
fig. 2 is a series-parallel conversion diagram of the excitation branch at the time of secondary open circuit.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. In addition, the technical features of the embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1, the T-type equivalent circuit of the induction motor employed in the present invention includes: primary resistanceAnd primary leakage reactanceAfter the two are connected in series, two parallel branches are connected, namely excitationA magnetic branch and a secondary branch; the excitation branch is formed by an excitation resistor +.>And excitation reactance->Formed in series, said secondary branch is formed by a secondary resistor +.>And secondary reactance->And the two are connected in series.
The invention relates to a parameter testing method of a linear induction motor, which is a method for testing parameters of the linear induction motor in a static state and comprises the following steps:
first, as shown in FIG. 1, the induction plate (i.e. conductive layer) of the motor secondary is taken out, the secondary yoke (i.e. conductive layer) is reserved, and a preset voltage is applied to the input end of the motor primary windingAnd frequency->And measuring the phase current effective value +.>Three-phase active power->. Primary resistance->And series excitation resistance->The relation of (2) is:
wherein the power factor in the state of taking out the conductive layerThe method comprises the following steps: />
wherein ,for the number of phases of the primary winding, +.>To take out the power factor angle in the conductive layer state.
as shown in fig. 2, in the parallel excitation branch, the core loss currentAnd excitation current->The expression of (2) is:
the primary core loss power is:
wherein ,the coefficient 0.5 is an empirical value considering the secondary yoke, and can be adjusted according to the actual duty ratio of the secondary yoke core loss.
As shown in fig. 2, the shunt reactanceParallel excitation resistor->Parallel-to-series replacement excitation resistor->And excitation reactance->。
In the excitation branch, an excitation resistor is connected in seriesParallel excitation resistor->With primary core loss->The relation of (2) is:
primary leakage reactanceAre generally difficult to directly measure, can be passed throughThe over-calculation method is indirectly obtained. In the engineering aspect, the method comprises the steps of,(parallel excitation reactance) (-)>) Therefore, series excitation reactance->Approximately equal to parallel excitation reactance->. Thus, when->In the case of known primary leakage reactance +.>The method comprises the following steps:
and secondly, recovering the induction plate of the secondary side of the motor, and performing a locked rotor experiment of the linear induction motor. Applying a preset voltage to the input end of the primary winding of the motorAnd frequency->And measuring the phase current effective value +.>Three-phase active power->。
Because the air gap of the linear motor is larger, the current in the excitation branch is larger than the current in the rotary motor. The parameters of the excitation branch cannot be ignored in the locked rotor experiment, so the total equivalent resistance of the excitation branch and the secondary branchReactance->The method comprises the following steps: />
wherein ,for the power factor angle in the motor locked-rotor state, < >>Is the power factor of the motor in the locked state.
the series excitation resistance calculated in the first stepSeries excitation reactance->The resistance in the secondary branch can be obtained>Reactance->:
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the invention and is not intended to limit the invention, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.
Claims (1)
1. The parameter testing method of the linear induction motor in the static state is characterized by comprising the following steps of:
the first step, the induction plate of the motor secondary as the conducting layer is taken out, the secondary iron yoke as the conducting layer is reserved, and the preset voltage is applied to the input end of the motor primary windingAnd frequency->And measuring the phase current effective value +.>Three-phase active power->The method comprises the steps of carrying out a first treatment on the surface of the Primary resistance->And series excitation resistance->The relation of (2) is:
wherein the power factor in the state of taking out the conductive layerThe method comprises the following steps:
wherein ,for the number of phases of the primary winding, +.>To take out the power factor angle of the conductive layer;
in the excitation branch, an excitation resistor is connected in seriesParallel excitation resistor->With primary core loss->The relation of (2) is:
series excitation reactanceApproximately equal to parallel excitation reactance->When->In the case of known primary leakage reactance +.>The method comprises the following steps:
secondly, restoring a secondary induction plate of the motor, and performing a locked rotor experiment of the linear induction motor; applying a preset voltage to the input end of the primary winding of the motorAnd frequency->And measuring the phase current effective value +.>Three-phase active power->;/>
Total equivalent resistance of exciting branch and secondary branchReactance->The method comprises the following steps:
wherein ,for the power factor angle in the motor locked-rotor state, < >>The power factor is the power factor of the motor in the locked state;
the series excitation resistance calculated in the first stepSeries excitation reactance->Obtaining the resistance in the secondary branch>Reactance->:
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CN116520144A (en) * | 2023-07-04 | 2023-08-01 | 中国科学院电工研究所 | Solid rotor induction motor rotor parameter testing method |
Citations (5)
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---|---|---|---|---|
WO2008064545A1 (en) * | 2006-11-28 | 2008-06-05 | Zhuzh Csr Times Electric Co., Ltd. | Control method of a linear induction motor |
CN109412483A (en) * | 2018-10-23 | 2019-03-01 | 深圳市深信创联智能科技有限责任公司 | The off-line parameter identification method of line inductance electromotor |
CN111257749A (en) * | 2018-11-30 | 2020-06-09 | 华中科技大学 | Offline measurement method for parameters of linear induction motor |
CN113589165A (en) * | 2021-07-14 | 2021-11-02 | 中车大连电力牵引研发中心有限公司 | Offline measurement method for parameters of linear induction motor |
CN113965124A (en) * | 2021-10-12 | 2022-01-21 | 中国科学院电工研究所 | Parameter calculation method of linear induction motor |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008064545A1 (en) * | 2006-11-28 | 2008-06-05 | Zhuzh Csr Times Electric Co., Ltd. | Control method of a linear induction motor |
CN109412483A (en) * | 2018-10-23 | 2019-03-01 | 深圳市深信创联智能科技有限责任公司 | The off-line parameter identification method of line inductance electromotor |
CN111257749A (en) * | 2018-11-30 | 2020-06-09 | 华中科技大学 | Offline measurement method for parameters of linear induction motor |
CN113589165A (en) * | 2021-07-14 | 2021-11-02 | 中车大连电力牵引研发中心有限公司 | Offline measurement method for parameters of linear induction motor |
CN113965124A (en) * | 2021-10-12 | 2022-01-21 | 中国科学院电工研究所 | Parameter calculation method of linear induction motor |
Non-Patent Citations (1)
Title |
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吕刚 等: "静止状态下直线感应电机的参数辨识方法", 北京交通大学学报, vol. 41, no. 5, pages 120 - 125 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN116520144A (en) * | 2023-07-04 | 2023-08-01 | 中国科学院电工研究所 | Solid rotor induction motor rotor parameter testing method |
CN116520144B (en) * | 2023-07-04 | 2023-08-29 | 中国科学院电工研究所 | Solid rotor induction motor rotor parameter testing method |
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